Shared Nothing Architecture
Shared nothing architecture provides low latency, high bandwidth, as well as high availability.
Popular Architectures for high transaction rate systems
The three most commonly mentioned architectures for multiprocessor high transaction rate systems are:
- Shared memory (SM), i.e. multiple processors shared a common central memory
- Shared disk (SD), i.e. multiple processors each with private memory share a common collection of disks
- Shared nothing (SN), i.e. neither memory nor peripheral storage is shared among processors
ScyllaDB
- ScyllaDB is the monstrously fast and scalable NoSQL database. Fully compatible with apache Cassandra and Amazon DynamoDB,
- ScyllaDB embraces a shared-nothing approach that increases throughput and storage capacity as much as 10X that of Cassandra.
- Comcast, Medium, Starbucks, Ola Cabs Adopted ScyllaDB to realize order-of-magnitude performance improvements and reduce hardware costs
Why Discord migrated from Cassandra to ScyllaDB
Cassandra is a LSM Based data store, reads are more expensive than writes. Writes are appended to a commit log and written to an in memory structure called a memtable that is eventually flushed to disk.
Reads, however, need to query the memtable and potentially multiple SSTables (on-disk files), a more expensive operation.
Read this blog how discord migrated to ScyllaDB to improve performance and lower latency levels.